Does your website collect identifying information on your visitors? If you think because you do not sell anything, ie. no shopping cart, and have no subscription services that you are not collecting identifying information on your site’s visitors then you are probably wrong. Most web servers log IP addresses along with the time of the visit and what that IP address read. ISPs keep logs showing which IP addresses were allocated to what users at particular times. Your logs can be correlated to their logs to identify a person. If your site as a comment form then you are definitely collecting information but more importantly that form gives you a name of a person to associate with the IP address without having to involve the ISP.